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Indicate that libm feature only builds on latest Rust

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Yoan Lecoq 2019-09-11 12:26:31 +02:00 committed by Josh Stone
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@ -35,6 +35,7 @@ default-features = false
``` ```
The `Float` and `Real` traits are only available when either `std` or `libm` is enabled. The `Float` and `Real` traits are only available when either `std` or `libm` is enabled.
The `libm` feature is only available with Rust 1.31 and later.
The `FloatCore` trait is always available. `MulAdd` and `MulAddAssign` for `f32` The `FloatCore` trait is always available. `MulAdd` and `MulAddAssign` for `f32`
and `f64` also require `std` or `libm`, as do implementations of signed and floating- and `f64` also require `std` or `libm`, as do implementations of signed and floating-